双咪唑离子液体C6(mim)2(InCl3-Br)2催化合成二苯甲烷的研究

摘要

In this paper, bisimidazolium ionic liquid [C6(mim)2](InCl3-Br)2 was synthesized by two-step synthesis method and the structure of ionic liquid was characterized by 1H NMR. The Lewis acidity of ionic liquids was analyzed by acetonitrile IR probe. Bisimidazolium ionic liquid [C6(mim)2] (InCl3-Br)2 was used to catalyze the synthesis of diphenylmethane. The effects of temperature, time and amount of catalyst on the reaction were investigated. The results showed that the bisimdazolium ionic liquid [C6(mim)2](InCl3-Br)2 was synthesized successfully, the Lewis acidity of bisimidazolium ionic liquid was stronger than that of InCl3, and the reaction was carried out at 50 ℃ for 5 h. The yield of diphenylmethane was 40.4 % when the amount of the ionic liquid was 1 mmol.%本文采用两步合成法合成双咪唑离子液体[C6(mim)2](InCl3-Br)2,经核磁共振(1H NMR)对离子液体进行了表征,采用乙腈红外探针法定性分析了离子液体的Lewis酸性.将[C6(mim)2](InCl3-Br)2用于催化合成二苯甲烷,考察了温度、时间和催化剂用量等对反应的影响.结果表明:合成了双咪唑离子液体[C6(mim)2](InCl3-Br)2,双咪唑离子液体的Lewis酸性强于InCl3,在50 ℃时反应5 h,离子液体用量为1 mmol时,二苯甲烷的产率为40.4 %.